Global variable in computer programming, a global variable is a variable with global scope, meaning that it is visible (hence accessible) throughout the program, unless shadowed The set of all global variables is known as the global environment or global state. A global variable is a variable declared in the main body of the source code, outside all functions, while a local variable is one declared within the body of a function or a block. In computer science, a local variable is a variable that is given local scope A local variable reference in the function or block in which it is declared overrides the same variable name in the larger scope In programming languages with only two levels of visibility, local variables are contrasted with global variables
The variable named x is a parameter because it is given a value when the function is called The integer 5 is the argument which gives x its value In most languages, function parameters have local scope This specific variable named x can only be referred to within the add_two function (though of course other functions can also have variables called x). Python syntax and semantics a snippet of python code demonstrating binary search the syntax of the python programming language is the set of rules that defines how a python program will be written and interpreted (by both the runtime system and by human readers) The python language has many similarities to perl, c, and java.
At the level of identifiers (names, rather than variables), this is known as name masking. Variable lifetime is contrasted with scope (where a variable can be used) Global and local refer to scope, not lifetime, but scope often implies lifetime In many languages, global variables are always static, but in some languages they are dynamic, while local variables are generally automatic, but may be static.
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